Car roof



C. D. BONSALL CAR ROOF Filed Jan. l0. 1925 ll v [N VENTO/6 anun-.41.11.14

Patented dan. 29, l924.

inn'rso STATI-:s

CHARLES DAVID BoNsALI.,` or PITTSBURGH, PENNSYLVANIA, AssIGNoa To I. H. MURPHY COMPANY, or New KENSINGTON, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

CAR ROOF,

Application filed' January 10, 1.923. Serial No.`611,755.

To all who/in. t may concern: f

Be it lrnown that I, CI-Inniins DAVID BON- sAIJL7 a citizen of the United States, and a resident of the city of Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented a newV and useful Improvement in Car Roofs, specification.

This'invention relates to car roofs of the to side plate of they car and areformed along their side margins with lapping portions that are rigidly secured together to form hollow weather-proofing seams or joints that function as car-lines.

One ofthe principal objects of t-he present invention is to increase the strength and rigidity.'4 of the roof by improving the sec-.

. Ing vrib Aor seam flange B, both ribs extendtionalshape and arrangement of the lapped portions of adjacentsheets. Another object is to utilize the seams or the joints as drain channels for `draining off water that` Other objects are*` may enter Said joints.

to reduce the weight of the roof, to simplify the construction thereof andto cheapen the cost of manufacture.

The invention consists `principally in shaping ,and arranging the cooperating marginal portions of the roof sheets to form hollowweather-prooiing seams or joints that are better fitted for takingcare of contemplated stresses; ,and it also `consists in the parts and `in the arrangements and combinations of parts hereinafter described and claimed.V A f `In the accompanying drawing, wherein like symb'ols refer to like parts wherever theyoccur, j j A .j

- Fig. luisa plan view of a portion of a car roof comprising my invention;y

`v Fig. .2 is an `enlarged transverse section through one-half of the car roof on the fio line 2 2 inuFig. l; l,

Fig. I3y isa cross-sectionthrough.one of thel seams at Fie 1;,y l ,I Fig. '4f is a similar `rsection taken' midway ofthe ridge and eaves on the line in g Fianna. Fig. 5 is a similar. section taken atythe side plate'ontheline 5- -5 in Fig. l; and Fig.4 6 is a cross-sectioi'through the eaves of which the following is aall-.steel riveted-up type wherein self-sup-f porting roof sheets extend from side plate.

the ridge on the line inr portion of the roof,` the section to be taken through lone of the seams on the line 6 6 in Fig. 1. I

yThe roof shown in the accompanying drawing comprises metallic roof sheets o vthat extend transversely of the car from eaves to eaves thereof with their side margins overlapping. The roof sheets slope,

, side plates.

One side marginv ofeach roof sheet is pressed up to form a strengtheningrib or seam flange A; andjthe other side of the margin is pressed up to form a strengthening fromkend kto endfof the sheet. 'The roo-f sheets are assembled on the car by placingthe type A ribof one sheet over the type B rib *of thefnext adjacent sheet tooform upstandingfhollowk seams or joints that extend from side plate to side plate and `serve as carlines.

The ribs of both typeshave a maximum depth at the ridge and gradually decrease in depth towards the eaves where they are curved downwardly yand merge into the plane of the sheets at the eaves ends thereof. The ribor seam flange A of each roof sheet is preferably of substantially invertedpL-Shaped sectionythat is, said rib A has a `nearly vertical web portion atthe top of which is an" outwardly` projecting` flange. The rib or seam-flange B `atrthe other side of said roofy sheethas an inverted L-shaped section at the ridge; and on opposite sides of the ridge the outwardly projecting lateral flange of said `rib B Vhas a channel 10 pressed therein which has a depth at the eaves .corresponding tothe depth of said rib and graduallyY decreases in depth towards theridgewhere it merges into the 'planevoflsaid lateral-top flange. The lapped ribs Avant/l Bof adjacent sheets are rigidly secured together by rows, of rivets llwhich extend lvertically y,throughthe lateral top flanges of saidrib'son oppositesides ofthe channel lO Vformed in the underlying lateral top aange of the" ribv B;

Running boards 12 are arranged lengthwise of the car at the ridge and are securely b-olted to the lateral flanges of channel-shaped running board saddles 13. The running board saddles 13 rest on and are vrigidly secured to the lapped ribs A and B By the arrangement described, the lappedY ribs A and B of adjacent sheets co-operate 1to form a seam construction whose crosssectional shape changes from a relatively deep inverted channel at the ridge to a shallow inverted channel at the eaves whose middle portion is provided with a hollow box-girder.

'It is noted that the seam or joint censtruction produced by the co-operating ribs of the type A and B accomplish the various functions of a carline. The sectional `shape of the seams or joints at the ridge serves to take vcare of the vertical roof load, and the cross-sectional shape of the seams or joints at the eaves serves to take care of 'the stresses that tend to rack and twist the car body and distort it endwise. This increased strength in the seams or jointsl enables a roof to be produced that will be stiffer and stronger than previous roofs of the same weight of metal. It is also noted that this seam construction provides a Y trough for carrying off any water that may enter the joints of the seams.

VThe invention is not limited to the precise shapes and arrangements of parts shown and described.

What I claim is:

1. A car roof comprising a plurality of roofrsheets whose adjacent marginal portions are offset upwardly and lapped and secured together to form weather proofing seams. the lapping portion of the lower sheet having a channel formed thereinthat extends longitudinally thereof.

2. A car roof comprising a plurality of roof sheets whose adjacent marginal portions are offset upwardly and lapped and secured together to form weather proofing seams. the lapped portion of the lower sheet 'of a seam having a channel formed there- Vin that extends lengthwise thereof and increases in depth toward the eaves. 3. A car roof comprising a plurality of roof sheets whose adjacent marginal portions are offset upwardly and lapped and secured together to form weather proofing seams of varying depth, the extent of offsetting being greatest near the ridge and decreasing towards the eaves, and the lapping portion of the lower sheet of a seam having a channel of varying depth formed therein that extends lengthwise thereof.

4. A car roof comprising a plurality of roof sheets whose adjacent marginal portions are formed into hollow seams whose cross-sectional shape changes from an inverted channel atV one point to an inverted channel at another point having a hollow boxV girder formed therein.

5. A car roof comprising a plurality of roof sheets extending from eaves to eaves and having their adjacent side marginal portions formed into stiffening ribs that are lapped and positively secured together to form weather proofing seams, said ribs having a maximum depth at the ridge and gradually decreasing in depth towards the eaves where they merge into the plane of the sheets, the underlying rib of a seam having a channel formed therein whichV has a maximum depth adjacent to the eaves and gradually decreases in depth towards the ridge where it merges into the plane of the top of said rib.

6. A car roof comprising a plurality of roof sheets extending from eaves to eaves and having their adjacent side marginal portions offset upwardlyl and are lapped and positively secured together along two lines to form weather proofingV seams, said seams having a maximum depth' at the ridge and gradually decreasing in depth towards the eaves where theymerge into the plane of the sheets, the underlying sheet of' a seam having a channel formedtherein between said lines which has a maximum depth adjacent to the eaves and gradually decreases indepth towards the ridge where it merges into the plane of the top of said rib, the eaves end portion of the overlapping sheet being provided with an opening.

7. A car roof comprising a plurality of' roof sheets extending from eaves to eaves thereof and having their adjacent side marginal portions offset upwardly and lapped to form seams, said lapped portions being rigidly secured together along two lines extending lengthwise thereof7 the portion of the underlying sheet between said lines being formed into a channel.

8. A car roof comprising a plurality of roof sheets extending from eaves to eaves thereof and having their adjacent side marginalportions offset upwardly and lapped to form seams,`the extent of offsetting being greater at the ridge than at the eaves, said lapped portions bei-ng rigidly secured together along two lines extending lengthwise thereof,V the portion of the underlying sheet between said lines being formed into a channel whichV has a maximum depth adjacent to the eaves and merges into the plane of the rib adjacent to the ridge.

v9. As an article of manufacture a. car

roof sheet, said sheet having its side mar-` ginal portions offset upwardly, the offset portion at one side margin of said sheet being formed with a channel that extends longitudinally thereof.

10. As an article of manufacture a car roof sheet, said sheet having its side marginal portions formed into ho-llow ribs, the rib at one side margin of said sheet being formed rwith a channel that extends longitudinally thereof and the rib at the other side margin of said sheethaving an opening in each end.

11. As an article of manufacture a car roof sheet, said sheet having its side marginal portions oifset upwardly, the extent of offsetting decreasing from the middle of the sheet towards each end, the offset portion at one side margin of said sheet beingformed with a channel that'extends 'longitudinally thereof.

12. As an article of manufacture a car roof sheet, said sheet having its side marginal portions formed into hollow ribs that decrease in depth from'the middle of the sheet towards each end, the rib at one side margin of said sheet being formed with a channel that extends longitudinally thereof and decreases in depth from the end portions of the sheetftowards its middle portion.

13. Acar roof comprising a plurality of roof sheets whose adjacent vside marginal portions are o'set upwardly and lapped and rigidly secured together along two lines to form weather proofing seams, the portion of the under sheet between such lines having a channel formedtherein that extends from the ridge portion of the sheet to the eaves ends thereof.

14. A car roof comprising a plurality of roof sheets whose adjacent side marginal portions are offset upwardly and lapped and rigidly secured together along two lines to form weather proong seams, the porvthis 4th day of January, 1923.

CHARLES DAVID BONSALL. 

